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/*
* Copyright (C) 2015-2022 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "NullSetterFunction.h"
#include "CodeBlock.h"
#include "JSCInlines.h"
namespace JSC {
const ClassInfo NullSetterFunction::s_info = { "Function"_s, &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(NullSetterFunction) };
#if ASSERT_ENABLED
class GetCallerStrictnessFunctor {
public:
GetCallerStrictnessFunctor()
: m_iterations(0)
, m_callerIsStrict(false)
{
}
IterationStatus operator()(StackVisitor& visitor) const
{
++m_iterations;
if (m_iterations < 2)
return IterationStatus::Continue;
CodeBlock* codeBlock = visitor->codeBlock();
// This does not take into account that we might have an strict opcode in a non-strict context, but that's
// ok since we assert below that this function should never be called from any kind strict context.
m_callerIsStrict = codeBlock && codeBlock->ownerExecutable()->isInStrictContext();
return IterationStatus::Done;
}
bool callerIsStrict() const { return m_callerIsStrict; }
private:
mutable int m_iterations;
mutable bool m_callerIsStrict;
};
static bool callerIsStrict(VM& vm, CallFrame* callFrame)
{
GetCallerStrictnessFunctor iter;
StackVisitor::visit(callFrame, vm, iter);
return iter.callerIsStrict();
}
#endif // ASSERT_ENABLED
namespace NullSetterFunctionInternal {
static JSC_DECLARE_HOST_FUNCTION(callReturnUndefined);
static JSC_DECLARE_HOST_FUNCTION(callThrowError);
JSC_DEFINE_HOST_FUNCTION(callReturnUndefined, (JSGlobalObject* globalObject, CallFrame* callFrame))
{
#if !ASSERT_ENABLED
UNUSED_PARAM(globalObject);
UNUSED_PARAM(callFrame);
#endif
ASSERT(!callerIsStrict(globalObject->vm(), callFrame));
return JSValue::encode(jsUndefined());
}
JSC_DEFINE_HOST_FUNCTION(callThrowError, (JSGlobalObject* globalObject, CallFrame*))
{
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
// This function is only called from IC. And we do not want to include this frame in Error's stack.
constexpr bool useCurrentFrame = false;
throwException(globalObject, scope, ErrorInstance::create(vm, globalObject->errorStructure(ErrorType::TypeError), ReadonlyPropertyWriteError, JSValue(), nullptr, TypeNothing, ErrorType::TypeError, useCurrentFrame));
return { };
}
}
NullSetterFunction::NullSetterFunction(VM& vm, Structure* structure, ECMAMode ecmaMode)
: Base(vm, structure, ecmaMode.isStrict() ? NullSetterFunctionInternal::callThrowError : NullSetterFunctionInternal::callReturnUndefined, nullptr)
{
}
}
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